Same problem. Wrote down COAX info, IP's DNS Etc. Disabled COAX enabled WAN assigned as static. Router Main Menu then said Internet OK, static IP connected. ONT WAN is active however browser will not access internet. On COAX now to post this. If/when I find solution I'll keep you "posted"
Does LED on the MI424WR WAN Jack go green when you plug in the RJ-45 from the ONT WAN?
If so it is active. I ASSUME